Application Research of Normalization Algorithm Based on EWMA-PCA in Standardization of Water Quality Spectral Data

Si-han ZHOU; Xin-yu HU; Bin TANG; Ming-fu ZHAO; Feng-xiao LI; Ren-jie WANG; Qi-sen XIAO; Yu XIAO

doi:10.3964/j.issn.1000-0593(2020)11-3443-08

Journals >Spectroscopy and Spectral Analysis >Volume 40 >Issue 11 >Page 3443 > Article

Spectroscopy and Spectral Analysis
Vol. 40, Issue 11, 3443 (2020)

Application Research of Normalization Algorithm Based on EWMA-PCA in Standardization of Water Quality Spectral Data

Si-han ZHOU^1,1,*, Xin-yu HU^1,1, Bin TANG^1,1, Ming-fu ZHAO^1,1..., Feng-xiao LI^1,1, Ren-jie WANG^1,1, Qi-sen XIAO^1,1 and Yu XIAO^1,1|Show fewer author(s)

Author Affiliations

¹[in Chinese]

¹1. Key Laboratory of Modern Optoelectronic Detection Technology and Instrument, Chongqing University of Technology, Chongqing 400054, China

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DOI: 10.3964/j.issn.1000-0593(2020)11-3443-08 Cite this Article

Si-han ZHOU, Xin-yu HU, Bin TANG, Ming-fu ZHAO, Feng-xiao LI, Ren-jie WANG, Qi-sen XIAO, Yu XIAO. Application Research of Normalization Algorithm Based on EWMA-PCA in Standardization of Water Quality Spectral Data[J]. Spectroscopy and Spectral Analysis, 2020, 40(11): 3443 Copy Citation Text

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Fig. 1. UV-Visible spectrum water quality detection system block diagram

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Spectra of 8 standard sample solutions measured under three spectrometers(a) Hamamatsu C10082CAH spectrometer;(b): Ocean Maya 200Pro spectrometer;(c): Optosky ATP2000 spectrometer

Fig. 2. Spectra of 8 standard sample solutions measured under three spectrometers
(a) Hamamatsu C10082CAH spectrometer;(b): Ocean Maya 200Pro spectrometer;(c): Optosky ATP2000 spectrometer

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Fig. 3. Water quality spectral data of 8 groups of potassium hydrogen phthalate solution
(a): COD 20 mg·L^-1; (b): COD 40 mg·L^-1; (c): COD 60 mg·L^-1; (d): COD120 mg·L^-1;(e): COD 160 mg·L^-1; (f): COD 200 mg·L^-1; (g): COD 400 mg·L^-1; (h): COD 801 mg·L^-1

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Fig. 4. Three sets of comparison experiments to determine the normalized data of water absorption spectra of each concentration
(a): Comparison 1; (b): Comparison 2; (c): Comparison 3

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Fig. 5. Standardized evaluation of water absorption spectra of each concentration measured by three sets of comparison experiments
(a): Correlation coefficient; (b): Variance; (c): Peak offset

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Concentration /(mg·L^-1)	Correlation Coefficient		Variance		Peak offset/%
Concentration /(mg·L^-1)	Original	Standardized	Original	Standardized	Peak offset/%
20	0.994 229	0.994 229	0.098 594	0.001 016	0.010 8
40	0.990 752	0.990 766	0.131 140	0.001 903	0.035 4
60	0.986 116	0.986 128	0.161 782	0.003 592	0.002 8
120	0.989 171	0.989 173	0.239 228	0.004 028	0.097 7
160	0.991 622	0.991 623	0.252 841	0.003 540	0.006 6
200	0.991 255	0.991 256	0.256 969	0.003 659	0.073 6
400	0.985 524	0.985 524	0.286 155	0.005 789	0.009 5
800	0.982 170	0.982 170	0.305 703	0.006 357	0.070 9

Table 1. Standardized evaluation of water absorption spectrum data measured by C10082CAH and Maya2000Pro spectrometer

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Concentration /(mg·L^-1)	Correlation Coefficient		Variance		Peak offset/%
Concentration /(mg·L^-1)	Original	Standardized	Original	Standardized	Peak offset/%
20	0.991 321	0.991 437	0.107 919	0.001 462	0.010 6
40	0.992 446	0.992 460	0.145 516	0.001 786	0.031 7
60	0.989 650	0.989 674	0.162 702	0.003 006	0.011 4
120	0.989 949	0.990 001	0.210 102	0.004 373	0.054 0
160	0.993 332	0.993 381	0.210 997	0.003 653	0.029 0
200	0.994 065	0.994 107	0.205 069	0.003 262	0.029 0
400	0.992 017	0.992 058	0.209 195	0.003 576	0.032 3
800	0.990 767	0.990 820	0.198 635	0.003 291	0.000 5

Table 2. Standardized evaluation of water absorption spectrum data measured by C10082CAH spectrometer and ATP2000 spectrometer

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Concentration /(mg·L^-1)	Correlation Coefficient		Variance		Peak offset/%
Concentration /(mg·L^-1)	Original	Standardized	Original	Standardized	Peak offset/%
20	0.995 236	0.995 267	0.001 574	0.000 841	0.021 5
40	0.995 680	0.995 707	0.003 461	0.000 823	0.003 7
60	0.995 278	0.995 304	0.004 107	0.001 005	0.014 2
120	0.995 401	0.995 418	0.006 540	0.001 301	0.043 7
160	0.995 752	0.995 765	0.007 556	0.001 338	0.022 4
200	0.995 540	0.995 550	0.009 044	0.001 494	0.044 6
400	0.994 192	0.994 200	0.013 650	0.002 087	0.022 8
800	0.991 849	0.991 857	0.022 398	0.003 049	0.003 7

Table 3. Standardized evaluation of water absorption spectrum data measured by Maya2000Pro and ATP2000 spectrometer

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